For years I had a night routine where I would moisturise my face and but vaseline on my lips thinking it would do you good overnight. Fact is at night is when everything renews, heals etc and when you put lipbalm on your lips it stops it from renewing itself underneath like its meant to. Infact that was when i noticed the change the first ever time when I stopped using anything at night, like a miracle suddenly my lips felt naturally lubricated.
I got this shit through accutane and literally had zero skin on my lips whatsoever its been a long process but after around 5 months properly leaving it alone all the time and a couple months before that leaving it alone at weekends (when i used to work) i am very nearly finished my lips feel absolutely fine still getting small crusts where the skin isnt quite fully built up yet but I can see patches where it is and I havent got long to go. Painful process but boy worth it not to live with this forever.